ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Isolating Transformers?

I have a 5 KVA 200-240 VAC 1Ø 2 Wire Primary × 120/240 VAC 1Ø 3 Wire Secondary Isolating Transformer with Faraday Shielding and Grounded Core, which is used for my Computer Equipment in the "PC Room".

The Transformer feeds an 8/16 space Square D NQOD Sub Panel, which contains IG kit and all that good stuff.

Have a few other Isolating Transformers which were parts of a 4 wire Wye Isolation setup. Three (3) separate transformers, which are also 5 KVA and shielded, but are straight 120 in, 120 out.

Use here and there to isolate a piece of equipment for testing purposes.

Scott35 S.E.T.

Hmm.. Sounds as though the secondary on your "1:1" xfmr actually has a few more turns than the primary. I'm surprised that the secondary voltage doesn't drop that much with a 100W load if it's only rated 150VA though. The regulation on smaller xfmrs is generally not that close.

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Bjarney, thanks for the suggestion! Why didn't I think of that?

Yes it can be done safely. The top of the tin can can be opened up (it's held by two sheet metal screws) giving access to the sockets and the flex. All I have to do is switch and re-solder the leads to the corresponding points, so it should be fine. Dropping 120 to 115 isn't bad at all...


Paul, I can live with a few extra turns...well...I guess you get what you pay for (US$20) but at least I can open the can it's in.

This is the device in question:



[This message has been edited by SvenNYC (edited 03-11-2003).]